Plaster board and block.



J0- UUIVH uup lunu,

COATING OR PLASTIC. Exami H. W. BELL.

PLASTER BOARD AND BLOCK.

APPLICATION nun MAY 2a, 1908.

932,098. Patented Au 24, 1909.

%', IZ6JS as fun /76502".-

MZM- mpw l f I a. My? Mae Y/M o. UUMIUSI Iowa,

COATING R PLASTIC.

.YJZ, g finer UNITED STATES PATENT OFFICE.

HARRY W. BELL, OF NEW YORK, N. Y.

PLASTER BOARD AND BLOCK.

T 0 all whom 'it may concern:

Be it known that I, HARRY IV. BELL, a citizen of the United States, residing at New York, county of New York, and State of New York, have invented certain new and useful Improvements in Plaster Boards and Blocks, fully described and represented in the following specification and the accompanying drawings, forming a partof the same.

The object of the present invention is to provide an improved composition for plaster boards to be used in place of lath and plaster, and for plaster building blocks such as partition blocks, sound deadeners, furring and the like.

I secure the desired result by a'composition composed of )la ter of Jams and 3a )er the latter being re uce to a nely in e or comminuted condition in a suitable cutting or comminuting machine so as to form a light, loose mass. Any suitable paper may be used, such as news )a mi, wrappin paper, card-board, or ot 1er waste paper ma eria rat can 0 cut dry to the finely divided, light, loose material desired.

The proportions of plaster and paper may be varied and will vary somewhat according to the character of board or block desired, the quantity of the paper required being such as to form the proper filler and bond for the plaster. For ordinary partition blocks I usually employ from 30 to 45 pounds of plaster to a cubic foot of block, with about four pounds 'of the comminuted paper. For extra strong blocks more plaster and less paper is used, and for blocks where little strength is required less plaster and more paper may be used, the amount of paper varying for the different classes of blocks desired from about three to about six pounds of paper. The quantity of plaster used may Vary from fifteen to sixty pounds of plaster per cubic foot according to-the strength and character of block desired. With the plaster and paper a small quantity of suitable filler, such as excelsior or similar fiber, may be used as a 1n er, 1 desired in any case, but generally this will not be desirable.

The preferred method of making the blocks is to mix the water and plaster as in the ordinary processes, ien put in the paper and thoroughly mix it with the thin plaster composition, and then pour into the molds quickly and before setting of the Specification of Letters Patent.

Application filed May 29, 1908.

Patented Aug. 24, 1909.

Serial Ito 435,639.

plaster. The plaster will then setv in the molds quickly with the paper distributed through the block, so as to form a light, porous block.

My plaster boards or blocks may be made without any layer of paper or other material on either side but a specific feature of the invention consists in a plasterboard formed of my improved composition with a layer of paper on one or both sides, or a plurality of layers of my plaster composition with intermediate layers of paper.

In the accompanying drawings forming a part of this specification I have illustrated the invention in some of its preferred forms, and this construction will now be described in detail and the features forming the invention then specifically pointed out in the claims.

In the drawing Figure 1 shows a plaster board consisting of a single layer of my composition with a layer of paper on each side. Fi 2 shows a hollow plaster partition block 0 common form embodying the broader features of the invention.

Referring to the drawing in Fig. 1, A is the plaster board proper formed of plaster and the comminuted paper, and B the layers of paper on opposite sides of the board.

In Fig. 2, G is the partition block formed of plaster and the comminuted paper. The block, also, may have layers of paper or other material applied to some or all of its opposite sides.

Among the important advantages of my improved plaster board or block are the following: its cheapness, in that any ordinary waste paper may be used; the extreme lightness of the comminuted paper, which produces a very light board or block, enabling them to be used in many cases Where the weight of other fireproof boards or blocks is prohibitive; the paper forms an excellent bond, making a very strong article; the composition may be oured to form the blocks, so that pressing into molds by skilled labor is not necessary as in the case of fiber blocks. An important advantage of the paper, in. pouring to form the blocks, is that the finely divided paper forms an excellent filler in the mold so that the fine plaster will not run off with the water leaking from the mold. The extreme lightness of the plaster composition secures a special result in connection with layers of paper outside the block or alternating with the plaster composition, in

UUHIIIU' UH FLHD l h that these la ers of a or ma be very light, as the weight to b e uppor ed by the adhesion between the plaster and aper layer is much less than in previous oards embodying such paper layers.

What I claim 1s 1. A plaster board or block formed of a mixture of laster and loose comminuted aper distributed, through the plaster to orm a porous composition, substantially as and in t e proportions set forth.

2. A plaster board or block formed of a mixture of laster and loose comminuted paper distri uted through the plaster to form a porous composition and having one witnesses.

HARRY W. BELL. Witnesses:

J. A. GRAVES, W. H. KENNEDY.

a; /JJ3/ fi e;

We m fa r L- a J 

